#include<cstdio>
#include<algorithm>
#include<cstring>
#define Nmax 1000005
int n,i,j,nr,l,nrc;
char s[Nmax],*p;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    gets(s+1); n=strlen(s+1);
    for (i=1;i<=n;i++)
    if ((s[i]>'Z' || s[i]<'A') && (s[i]<'a' || s[i]>'z'))
    s[i]=' ';
    p=strtok(s+1," ");
    while (p)
    {
        nrc++;
        l+=strlen(p+1)+1;
        p=strtok(NULL," ");
    }
    printf("%d",l/nrc);
    return 0;
}